Number ending with 0,2,4,6, or 8 are divisible by 2. These are also known as Even numbers.

A number is divisible by 3 if the sum of its digits is divisible by 3.

36 Sum of digit is 3+6 = 9 is divisible by 3 and so 36 is divisible by 3.

Not if you have a very large number then you can apply the same rule multiple times to determine the divisibility.

As an example 222369963222222369555963 sum of...

Divisibility Rules: Is Number Divisible by 2,3,4,5,6,7,8,9]]>

We can write 5 as half of 10. So now lets say we would like to multiply 28 and 5 using the above formula.

First half of 28 is 14

Now multiplying by 10 gives 140 and so answer of 28×5 is 140.

The same thing can be applied to 50 which is half of 100 i.e. 1/2×100

Generalizing the above logic we can apply it to 500, 5000 …]]>

Step 2: Sum all the numbers in odd places i.e. digits in the first, third, fifth places and so on

Now subtract the result of step 1 from result of step 2 and if the answer is either 0 or a number divisible by 11 then the number is divisible by 11.

1375 ((3+5) – (1+7) = 0) So 1375 is divisible by 11.

4818 ((8+8) – (4+1) = 11) So 4814 is divisible by 11.

4564 ((5+4) – (4+6) = -1) So 4564 is...

Divisibility Rule for 11]]>

a test has 90 questions. Each correct answer is awarded 1 mark, each wrong answer is awarded 0.5 marks and each unanswered question is awarded 0.25 marks. a candidate scored 5 marks in this test. the number of wrongly answered questions by him cannot be more than?

1) 55 2)60 3)65 4)70]]>

Keep the Solutions and discussion about the questions in ~~quAnts: solutions~~

Am starting with Number Theory..

1. The largest number amongst the following that will perfectly divide 101100 - 1 is

(1) 100

(2) 10,000

(3) 100100

(4) 100,000]]>

:hurray:]]>

each minute has 60 sec. As on earth, the hour hand covers the dial twice every

day.Find the approximate angle between the hands of a clock on Oz when the time]]>

what is the HCF of the numbers represented by n(n^2+20), n being an even no]]>

Let’s add 1 hr and 35 mins and 3 hr 55 mins together.

What you do is this:

make the 1 hr 35 mins into one number, which will give us 135 and do the same for the other number giving us 355

Now you want to add these two numbers together:

135

355

____

490

So we now have a sub total of 490. What you need to do to this and all sub totals is add the time constant of 40.

No matter what the hours and mins are, just add...

Adding Time]]>

1. If the numerator and denominator of a fraction are increased by 1 the fraction formed is 2/3. If both numerator and denominator are decreased by 2 the result is 3/5. what fraction is formed by both numerator and denominator are increased by 4?

a.7/10 b.9/11 c.5/7 d.3/4

Some tough problems in leniar equations]]>

1) 43.25

2) 36.25

3) 41.50

4) 32.25

5) more than one of these]]>

plz help. thank u]]>

The day you decide , you wake up, thats day is perfect to start even if CAT is today. Only the thing which should change - your approach towards preparation.

So, the basics discusses below are kinda MUST DO at all points of time, unless you have CAT just 1 week away .

Let me take you back to your Class 4 and Class 5.

Yes ! you will...

Quantitative Aptitude : Basics I]]>

1.The Pearson Guide To Quantitative Aptitude For The CAT

2.R S Agarwal

3.How To Prepare For Quantiative Aptitude For The CAT by Arun Sharma

4. Analytical & Logical Reasoning For CAT by B S Sijwali, Ajay Singh]]>

1. In how many ways 8 people be seated round a square table (with 2 seats on each side).

2. In how many ways 8 people be seated around a square table (with 3 seats on each side).

3. In how many ways 8 people be seated around an equilateral triangle square table (with 4 seats on each side).]]>